[zigbigadoru]

so im planning on swapping to a 5.4L pretty quickly but ive been told that i shouldnt put in the 373 gears i have cuz it will be too much. but why would it be too much? people with 500+ hp have 373 gears and are doing fine. can anyone clue me into why i shouldnt put gears in?

[StangAddiction]

If you're going all motor i recommend 4.10s. 3.73s will be fine. The motor will make more torque but that's easily fixed with clutch and accelerator control, good tires, and suspension. 4.10s wont be too much, let alone 3.73s..

[zigbigadoru]

i also plan on going supercharger......pretty sure 5.4L+KB+4.10s would be too much

[MustangMatt96GT]

not with sticky tires..

[Boomer]

Camshaft selection may be something to look at as well, longer duration may require more gear. The added duration is going to move the torque and horsepower up further, you may want more gear to get the engine to rev up faster. Tire size can also make a fair change on final drive ratio, put every option into making the proper gear choice. You can spend hours choosing the right part, or take someones uneducated guess. Do a little research and it will save you a ton of heartache in the future.. Good luck with your choice !!!!!

[StangAddiction]

well with a KB supercharger you may want to be a little more conservative with the gearing as they make a considerable amount of bottom end torque, especially through 331 ci of displacement...Now Centrifugal superchargers, they favor more gearing...

And turbos like more load on the motor so they work well with conservative gearing..

[zigbigadoru]

i dont think you guys realize how much torque the 5.4L makes by it self. it will make 377 ft/lbs if you just throw it in a mustang. thats not including a supercharger. with a supercharger it will be well into the 500 if not 600. add in i dont know long tubes, cams, o/r h, catback, cai, etc and im not thinking that high gears would be smart at all. im asking is if i should get rid of my 373 or if they would still be useable after the 5.4L. and yes i plan on getting cams for my 5.4.

[96blackgt54]

3.73's are a bit to low for an engine that makes it power from torque.(I assume you are talking about 2V?) You're right! These 2V 5.4l are beast for torque and would be a better idea to stay at or below 3.27 gears. I know this sounds silly! With the stock 4.6l intake, adapters, cams, shorty headers(long tubes require modifications) and ported heads, you will bairly make it past 5000rpm's. But your torque is crazy off idle and that's where the high gears will sing their best.
So should you get rid of the 3.73's? I would have said yes 6 months ago, but the new HPS Hardballer 5.4l intake is almost here and a guy has developed some long tubes just for the 5.4l swap(4.6l long tubes will not work, some brands fit on the pass side, but the driver side is complicated and no brands fit). If you can crab those then maybe the 3.73's will scream.
But the guy behind most of the development for the intake and long tubes still says that 3.27's are the best gear for the set up.

[96blackgt54]

Mustang Forums

Look for the 160page 5.4l swap! Go ahead and register and ask Questions.

[white_fang]

your cuz doesn't know what he is talkin about. go 4.10 or 4.33

[MikeD05GT]

4.30's are a tad steep...4.10's are the way to go... even 3.90's i know ford doesnt make them and thats why alot of people dont use them...

[MustangMatt96GT]

Originally Posted by zigbigadoru i dont think you guys realize how much torque the 5.4L makes by it self. it will make 377 ft/lbs if you just throw it in a mustang. thats not including a supercharger. with a supercharger it will be well into the 500 if not 600. add in i dont know long tubes, cams, o/r h, catback, cai, etc and im not thinking that high gears would be smart at all. im asking is if i should get rid of my 373 or if they would still be useable after the 5.4L. and yes i plan on getting cams for my 5.4.

It's not going to make thy power at the tire, atleast stock... But HCI it should

[StangAddiction]

Originally Posted by zigbigadoru i dont think you guys realize how much torque the 5.4L makes by it self. it will make 377 ft/lbs if you just throw it in a mustang. thats not including a supercharger. with a supercharger it will be well into the 500 if not 600. add in i dont know long tubes, cams, o/r h, catback, cai, etc and im not thinking that high gears would be smart at all. im asking is if i should get rid of my 373 or if they would still be useable after the 5.4L. and yes i plan on getting cams for my 5.4.

Man you're over exaggerating.... I make ~340 rwtq and my car is fine with 4.10s. A 5.4 will make a strong torque curve but seriously, on an all motor engine 3.73s will not be as bad as you think. Even built it wont be as bad as you think. Actually, numerically higher gearing is required with cams and headwork anyways. Not to be rude or anything, but you should do some research man... Show me a modified all motor 5.4 mustang with 2v, 3v, 4v whatever, that uses anything less than 3.73s and i'll retract my statement.

Originally Posted by jlaw98gt 4.30's are a tad steep...4.10's are the way to go... even 3.90's i know ford doesnt make them and thats why alot of people dont use them...

Most people dont use 3.90s because most non-FRPP gears whine a little. From what i can understand they're also a little more difficult to get lined up with the shims and all as well during installation.

Originally Posted by MustangMatt96GT It's not going to make thy power at the tire, atleast stock... But HCI it should

Man If you're gonna get a KB SC down the road, seriously, go 3.55s or 3.73s. To go below the stock gearing would be idiotic... You could stay at stock gearing but it wouldnt be best for acceleration purposes. Trust me, you'll learn to drive with the higher gearing and it wont be a big deal...

Who wants a mustang that cant spin the wheels anyways?

[96blackgt54]

Originally Posted by white_fang your cuz doesn't know what he is talkin about. go 4.10 or 4.33

Who's my cuz? I assume you're post is a follow from mine.

Maybe my "cuz" is the guy developing most of the parts for the 5.4l swap. And maybe,.......just maybe.......my "cuz" knows what he is talking about.

I tend to think my post through before I post it.

3.27's!

[r3dn3ck]

I have a 5.4L NA car and I'm tellin ya' 3.55's are about it for a street car. I have 3.55's and I can completely lose traction at the drop of a hat pretty deep into 3rd on 275/40/17's. 3.73's if you have an automatic tranny. The whole reason you put low ratio gears on in the first place is to make up for a lack of tq. So wouldn't it make sense to go back to a higher ratio gear when you've added the very thing your car used to lack?

3.27's are still PLENTY of gear for a 5.4 powered mustang. There's photographic evidence of a NPI 5.4 equipped stang with 3.27's traveling in excess of 160MPH and it was still pulling according to the driver. You don't need the gear so don't install it.

[zigbigadoru]

ok. thank you very much, i just needed a confirmation on it. thanks for all the help and info.

[330CubeGt]

my 5.4 is going in as soon as i get a damn clutch but im still keeping my 4.10s

[r3dn3ck]

Hey guys... check it:

The first intakes (pre-production unit) has shipped and the install was a success. Check out : Anyone intrested in 5.4L swaps, in here. Need you to opine. - Page 164 - Mustang Forums for pics.

The guy with that car has a nitrous plate kit under his upper plenum and it still cleared a stock ford hood. Intake price is set at 795 from what I hear. For more pics check out 54

Headers will be available soon. We've got 2 suppliers now. More news on that as it's available.

[96blackgt54]

Originally Posted by r3dn3ck Hey guys... check it: The first intakes (pre-production unit) has shipped and the install was a success. Check out : Anyone intrested in 5.4L swaps, in here. Need you to opine. - Page 164 - Mustang Forums for pics. The guy with that car has a nitrous plate kit under his upper plenum and it still cleared a stock ford hood. Intake price is set at 795 from what I hear. For more pics check out 54 Headers will be available soon. We've got 2 suppliers now. More news on that as it's available.

Dang it!

I'm trying to post pics of the intake here, but can't
What am I doing wrong?

HPS did a fabulatious job on the intake. Just like the 4.6l intake, no other company compares to the craftmanship.

Wished the intake was available when I did my 5.4l swap

[r3dn3ck]

but it is now... wink